Piezoelectric vibration energy harvesting: A connection configuration scheme to increase operational range and output power

Abstract

For a conventional monolithic piezoelectric transducer (PT) using a full-bridge rectifier, there is a threshold voltage that the open-circuit voltage measured across the PT must attain prior to any transfer of energy to the storage capacitor at the output of the rectifier. This threshold voltage usually depends on the voltage of the storage capacitor and the forward voltage drop of diodes. This article presents a scheme of splitting the electrode of a monolithic piezoelectric vibration energy harvester into multiple ( n) equal regions connected in series in order to provide a wider operating voltage range and higher output power while using a full-bridge rectifier as the interface circuit. The performance of different series stage numbers has been theoretically studied and experimentally validated. The number of series stages ([Formula: see text]) can be predefined for a particular implementation, which depends on the specified operating conditions, to achieve optimal performance. This enables the system to attain comparable performance compared to active interface circuits under an increased input range while no additional active circuits are required and the system is comparatively less affected by synchronized switching damping effect.

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“…It can be seen that the voltage V P T is correctly flipped for this half period and the signal SY N is synchronously generated to flip V P T . While using an inductor with higher inductance, the voltage flipping efficiency is increased, which has been studied in equation (9). Fig.…”

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“…7b) was modeled to examine the effect of the different elements of the MIM-based and IDEbased modules. In this model, the piezoelectric element is represented as a sinusoidal current source (Ip) connected in parallel to its internal resistance (Rp) and capacitance (Cp) [27], [30], [31]. The resistance and capacitance values were adjusted based on the electrical characterization of the piezoelectric elements.…”

Energy Harvesting for System of Coupled Oscillators Under External Excitation in the Vicinity of Resonance 1:1

“…Such device is able to harvest more energy than the traditional single degree-of-freedom one, when subjected to harmonic force or base displacement excitations. The efforts to increase various aspects of efficiency the harvester have been undertaken in papers [21][22][23][24].…”